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1. What is the difference between 'let' and 'var'?
2. What is the 'this' keyword?
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3. What is prototypal inheritance?
4. What is a closure?
5. What is the difference between '==' and '==='?
6. What is the event loop?
7. What is a promise?
8. What is a callback function?
9. What is the purpose of the 'async' and 'await' keywords?
10. What is the difference between 'class' and 'function'?